Spark-arrester.



P. G. SAGGAGGIO & P. A. LAGRANGE.

SPARK ARRESTER.

APPLICATION FILED APR. 13, 1914.

Patented Jan. 19, 1915.

3 SHEETS-SHEET 1.

THE NORRIS PETERS CO.. PHOTO-LITHQ. WASHINQ TON D P. C. SAGGAGGIO & F. A. LAGRANGE.

'SPARK ARRESTBR.

, APPLICATION FILED APRJS, 1914.

Patented Jan. 19, 1915.

3 SHEETS-SHEET 2.

THE NORRIS PETERS CO.. PHOTC-LITHO. WASHINGTON. D. C,

P. c. SAGOAGGIO & F A. LAGRANGE.

SPARK ARRESTER- APPLICATION FILED APR. 13, 19141I Patented Jan. 19, 1915.

3 SHEETSSHEET 3.

THENORRIS PETERS 60., PHOTO-LITHEL. WASHINFTON. D. C.

- rrED s ATEs PATENT OFFlfiE.

PEDRO CELESTINO SACCAGGIO AND FEDERICO ALEJANDRO LAGB/ANGE, OF BUENQS AIRES, ARGENTINA.

. SPABK-ARRESTER.

Specification of Letters latent.

Patented Jan. 19, 1915.

Application filed April 13, 1914. Serial No. 831,426.

To all whom it may concern:

Be it known that we, PEDRO OELns'rmo Sacoaocro and Fnonnroo ALEJANDRO LA- onnrzon, residing at Buenos Aires, Argentina (whose post-ofiiceaddress is Calle Cangallo No. 876, Buenos Aires, Argentina), have invented certain new and useful Improvements Relating to Spark-Arresters; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention is for improvements in or relating to spark arresters such as are used in steam locomotive, or stationary engines, to prevent the scattering of hot cinders which involve the risk of fire.

The present invention consists in the combination in locomotive or other engines of a chamber such as the smoke-box between the furnace and the outlet for the products of combustion, a screen disposed in this chamber at the inner or intake end of the outlet and means for maintaining the screen in motion across the. path of the products of combustion; the preferred arrangement is one in which the speed of movement of the screen is equal to the velocity of the products of combustion. The screen may be rotatably mounted and provided with blades so dis- ..posed that the flow of gases from a furnace or engine cylinder causes the rotation of the screen; the screen is preferably cylindrical and-arranged so that 1t communicates at one end with the funnel or discharge passage and the products of combustion enter through the peripheral mesh of said screen. When thus situated the screen may constitute a continuation from the exhaust conduit of the cylinders so that a contlnuous conduit is of an alternative construction. Figs. 3 and 4 are a section and elevation respectively of the bearing on which the rotary cage is mounted. Fig. 5 is a section of the skeleton frame and bearing. Fig. 6 is an elevatype bounded on one side by the tube plate D in which are mounted the smoke tubes D and on the other side by the smoke-box door E by which access is had to the interior of the smoke-box when required.

The exhaust pipe F from the cylinders is led in, in the usual manner at a position beneath the funnel C so as to induce a draft through the fire-box and smoke tubes by the ejector action of the exhaust. On top of the exhaust tube F a ring blower G for high pressure steam is also provided in the usual manner.

An extension 0 of-the chimney is provided extending downward into the smokebox and it carries near its lower end an internal cross-piece C comprising radial ribs and a central boss C This cross-piece is held in place by bolts passing through the member C From the boss C there depends a rod C as shown in Fig. 3 on which is mounted a sleeve A by means of ball bearings A, A which are designed to allow the free rotation of the sleeve A on the rod C and at the same time to maintain in it the same longitudinal position by taking up any end thrust in either direction. A cap A is provided on the lower free end of the sleeve A and some form of suitable labyrinth packing A to prevent the entry of dust or other deleterious matter into the interior of the sleeve A and into'the bearings. Preferably these bearings are submerged in a lubricating oil which is suitable for use at the temperatures attained in this portionof the smoke-box. The temperature is not excesenveloped in exhaust steam.

On the sleeve A is mounted the skeleton frame work of the spark arrester. As shown in Fig. 5 this frame work comprises radial spoke H m unt d 2. 1 l e A. a connected by longitudinal members which also are tied together circumferentially by a top angle-ring H a central ring H and a bottom annular plate H 1 The parts are so proportioned and disposed that the angle ring H has one flange disposed axially within the member C? and the. other flange disposed radially close to the end of the member G a small clearance is. provided to, allow the free rotation of the spark arrester and to prevent it getting jammed by particles of soot orcinders.

"The. top of the exhaust pipe F is titted with a flange F which lies close to and overlaps the annular'plate. H forming the bottom of the, liramework of the. rotating member. These two plates are brought as close together as is convenient to prevent any of: the productsof combustion entering the spark arrester except. inthe desired manner. A wire netting or. screen A is secured on this framework to. form a complete cylinder through which the products of combustion enter radially; they leave it axially and pass up the funnel.

Referring now to. Fig. 6, in this construction a series of iian blades J are mounted between the radial flange of the angle member H and the bottom plate Hf and the wire netting or screen of the desired mesh is secured outside them as shown in Fig. 2. These fan blades J are so proportioned and adjusted as to, be acted upon by the products o1": combustion entering the spark 'arrester radially and to drive it at thedesired rate. By. varying the size or setting of the blades any desired speed of rotation can be obtained.

The preferred arrangement. is such that the peripheral velocity of the netting is equal to the, velocity of the products of combustion when they enter ituiider the action ofthe blower- G or exhaust pipe F. i In the construction shown in Figs, 9 and 10 the longitudinal blades J are omittedand a set of blades K are mounted radially on the sleeve A in the ordinary propeller form.

These blades are acted uponidirectly by the steam from the exhaust pipe F or the blower and bring about the desired rotation of the ca e. i i

' In t 'e construction shown in Figs. and 11:, both sets of fan blades J and Kare used simultaneously so that the cage is rotated by the joint action 0t thesteam on the ra dial fan blades and oli the products of com bustion on the longitudinal fan blades.

In the constructions shown in Figs. and 10 the productsof combustion in addition to. the steam act on the fan blades K and produce a driving effect, as they pass outward into the funnel oi the locomotive.

l t will be appreciated that in any constructionin which the products of combustion hem elves. n re e the drivi g cited on the fan, the speed ofrotation of the fan will vary with the quantity of such products as are passing through, that is to say, the speed of the fan varies approximately with the speed of the products of combustion. A similar effect is obtained when the fan is operated by the, steam blast which regulates the flow of the products of combustion and if it is desired, a mechanical drive for. the spark arresten giving the same. proportion ality could beobtained by driving it fronra tan which, producesa to. regulate the quantity of the products. of combustion.

With regard to. the. mechanical details of this invention, various modifications may be made without departing-from the spirit of the. invention. Thus, for example, any suitable form or labyrinth packing A? may be used and it may conveniently be provided with a cavity or grooves filled: with some absorbent material such as cork to prevent the. entry 01:": water into. the interior of the sleeve A Also, instead of filling the sleeve A with lubricating. oil, graphite or other lubricant may be. used if desired.

The netting or screen is preferably placed outside. the. longitudinal tan blades 4]" because. these blades derive their motion from I the action of the gases and theretor have a less linear. velocity than have the gases themselves; by arranging the screen at a larger radius, this. diminution in linear velocity may be. compensated for so thatthe screen moves at approximately the same speed as the. gases themselves i "If-he mesh of the sereenis selected according to. the special requirements ofi anyparticular case and making it sutficiently fine the quantity of solid "matter escaping through the tunnelor' chimney may bere duced to any desired extent.

It has heretofore been proposed to provide a spark arrest er consisting of a screen through which the products of; combustion pass on their way 'to atmospher the screen intercepting the solid particles; this screen was provided with fan blades so that the flow oh the exhaust gases caused it to rotate and was arranged totravel acrossthe open end of the exhaust conduit dairirng a portion of'its pathand during the remaining portion 0t its path to travelacross a hopper so that solid particles received by the screen from the products of combustion were carend of the outlet from which the exhaust is discharged and it will be seen that the present invention difl'ers from the aforesaid known constructiom'since in the latter case the screen serves the function of a conveyer by which the solid matter is conveyed out of the path of the gases and the screen must be of sufficiently fine mesh to intercept all the solid particles which are not to be allowed to escape.

What we claim as our invention and desire to secure by Letters Patent is 1. In a spark arrester, the combination, with a smoke-box provided with an outlet pipe, of a vertical shaft suspended from the outlet pipe and-arranged on its axis within the smoke-box, a closed protecting tube inclosing the said shaft and provided with bearings which revolve on the said shaft, a screen carried by the said tube and arranged with its upper end communicating with the said outlet pipe, a blast pipe delivering into the lower part of the said screen, and fan said shaft, a screen secured to the said frame and arranged with its upper end in communication with the funnel, fan blades operatively connected to the revoluble parts, and a blast pipe arranged to deliver into the lower end of the screen.

In testimony whereof we have affixed our signatures, in presence of two witnesses.

PEDRO GELES'IINO SACGAGGIO. FEDERICO ALEJANDRO LAGRANGE.

Witnesses:

EVAN GRANT, RALPH WALTER HUNTINGTON.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

